import java.util.HashMap;
import java.util.Map;


public class MapTets {
	public static void main(String[] args) {
		Map<String, Boolean> range = new HashMap<String, Boolean>();
		range.put("123", true);
		
		System.out.println(range.get("123"));
		System.out.println(range.get("456"));
		
		if(range.get("456")){
			System.out.println("yes");
		}else{			
			System.out.println("no");
		}
		
		
		
	}
}
